nostr:npub1n0stur7q092gyverzc2wfc00e8egkrdnnqq3alhv7p072u89m5es5mk6h0 has a bookmark feature. No categorization though.
The implementation possibility (lists of posts) DOES exist on nostr, however. But “social” clients are still kinda slow to “differentiate” from the standard Twitter model. This will come.